How is the Total Amount calculated?

• A. Amount = Base Charge + (Unit Charge * Quantity). If base charge is left blank, the base charge is automatically $0
• B. Amount = Base Charge - (Unit Charge * Quantity)
• C. Amount = Unit Charge * Quantity
• D. Amount = Base Charge + Quantity

Answer: (A)

The main idea is that the total amount combines a fixed base fee with a variable fee that depends on quantity. The correct formula adds the Base Charge to the product of Unit Charge and Quantity, capturing both the fixed starting fee and the per-item cost. If the base charge is left blank, it defaults to $0, so the total becomes just Unit Charge times Quantity, which makes sense when there’s no fixed setup or service fee.

For example, with a base charge of $5, a unit charge of $2, and a quantity of 3, the total is 5 + (2 × 3) = 11. The other approaches either subtract costs, ignore the base charge, or add base charge to quantity without multiplying by the unit price, which wouldn’t reflect how per-item costs accumulate.